JPH05153807A - Reversing power take-out device for mobile agricultural machinery - Google Patents

Abstract

(57) [Abstract] [Purpose] In an agricultural tractor that drives and rotates a work machine that lifts and lowers the power take-off shaft 2 in the forward and reverse directions to suspend it from the machine body 1, an automatic control program that is performed during forward rotation and a control program that is performed during reverse rotation (automatic , Regardless of manual operation) was changed in conjunction with the forward / reverse switching of the power take-off shaft 2 so that the next work change during reverse work was not repeated. [Structure] A power take-off shaft 2 is projectingly provided from an end of the machine body 1, and a rear cover 7 angle-sensing automatic plowing depth control tiller 3 is attached to the vicinity of the power take-up shaft 2 so that the power take-up shaft 2 and the tiller 3 can be freely moved. In the mobile agricultural machine 4 in which the drive direction of the power take-out shaft 2 can be changed to the forward rotation / reverse rotation, the forward rotation is changed when the drive direction of the power take-out shaft 2 is changed to the reverse rotation. The reverse power take-out device for mobile agricultural machines, which is characterized by deactivating 5 circuits of the normal automatic plowing depth control which is sometimes operated and switching to the original 6 circuits of plowing depth control for reverse rotation to continue tilling work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversing type power take-out device for a mobile agricultural machine, and an automatic plowing depth control performed when the power take-off shaft rotates forward and a plowing depth control performed when the power take-off shaft rotates in reverse. To do.

[0002]

2. Description of the Related Art Conventionally, a rear cover angle sensing system is mounted so as to be able to move up and down with respect to a machine body regardless of whether the power take-off shaft is used in a forward rotation state or a reverse rotation state. The automatic control circuit of the automatic tillage depth control type tiller was the same control circuit. In such a conventional control circuit, the power take-off shaft is normally rotated (the plowing mud is blown backward).
In this condition, the soil surface is excavated to a certain depth with the plowing blade, which is the main part of the plowing tool, and the angle of the rear cover hung at the rear of the plowing blade is read to calculate the plowing depth and calculate the plowing depth. The tiller is automatically adjusted up and down to match the set value.

In this state, when the power take-off shaft is rotated in the reverse direction, the tilling blade is also rotated in the reverse direction (the tilling mud is blown forward). Here, the case of a special double-edged tillage claw having excavating blades on both front and rear surfaces and a normal single-edge tillage claw having an excavating blade at only one side will be described. First, in the double-edged plowing claw, when the aircraft is advanced while the plowing mud soil is blown forward by the reverse rotation of the plowing blade, most of the mud blown by the plowing blade comes out to the front, so the mud soil to the rear cover behind the plowing blade is Direct impact is reduced. On the other hand, the scattered mud during normal rotation is blown rearward and directly impacts the rear cover at the rear to swing the rear cover more than the amount of soil, so even if the same depth is set for plowing depth control. Since the rocking angle of the rear cover is different, different tillage depth control is performed.

That is, the control operation of the conventional device in this case is as follows.
Even if the control operation is performed with the same set value, the working depth of the finish does not match at the time of forward rotation and at the time of reverse rotation, and the depth of excavation is deeper at the time of reverse rotation. Next, when the single-sided tillage claw is attached in a setting for performing the tilling work at the time of forward rotation and the tilling work is performed, the mud is pushed by the back surface of the tilling blade at the time of reverse rotation.

In this case, when the back surface of the plowing blade is made to act on the mud in uncultivated land, a large load acts on the plowing blade, so normally, the excavated mud that is plowing in the normal rotation is put on the back surface of the plowing blade. It is an attempt to move the soil forward by pushing it strongly forward. For work that emphasizes soil movement performance rather than excavation,
The reverse rotation of the single-edged tillage claw is used.

That is, the control operation of the conventional device in this case is as follows.
Even if the control operation is performed with the same set value, there is a large resistance to the plowing of the plowing blade into the soil, and even when the plowing depth setting is the same setting, the plowing depth control becomes shallower in the reverse rotation than in the normal rotation. It doesn't match. In other words, the tilling depth changes due to the change in the subduction resistance, and the unevenness on the ground surface becomes more severe than before the work.

In order to carry out a stable soil movement, the plowing depth setting is changed to a shallow depth during automatic reversal or automatic control is performed, or the tiller is adjusted up and down with the eyes of the driver. In this way, in the conventional forward / reverse rotation of the power take-off shaft, different work is performed in accordance with the forward / reverse rotation.Therefore, the setting value of the automatic plowing depth control can be adjusted or changed or manually adjusted depending on the next work purpose. A complicated operation was required in order to change the work as an expression.

[0008]

SUMMARY OF THE INVENTION The present invention intends to automatically change the above-mentioned various conventional systems to a necessary control system in conjunction with forward / reverse switching in accordance with the next work. Therefore, the following technical measures were taken. That is,
A power take-off shaft 2 is projected from the end of the machine body 1, and a rear cover 7 angle-sensing automatic plowing depth control tiller 3 is attached to the vicinity of this so that it can be moved up and down, and a universal joint is provided between the power take-off shaft 2 and the tiller 3. In the mobile agricultural machine 4 in which the drive direction of the power take-off shaft 2 can be changed to the forward rotation / reverse rotation by interlocking connection via 8, when the drive direction of the power take-out shaft 2 is changed to the reverse rotation, the normal automatic plowing depth is used. The control 5 circuit was made non-operation, and it was made the structure of the reversing type power take-out device of the mobile agricultural machine which was characterized by continuing the tilling work by switching to the original 6 circuits for controlling the reverse working tillage depth.

[0009]

The present invention has the following technical effects with the above configuration. That is, in accordance with the next work, the power take-off shaft 2 is switched forward / reversely and automatically changed to a necessary control method and automatically returned to the previous state, so that the control operation at the time of forward rotation and reverse rotation is performed in advance. Since it is only necessary to specify and set, the operation becomes easy.

[0010]

Embodiments of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are as follows.
Unless otherwise specified, the scope of the present invention is not intended to be limited thereto and is merely an illustrative example.

In the illustrated example, a top link 9 and left and right lower links 10 are provided at the rear of the agricultural tractor which is the mobile agricultural machine 4.
The present invention is folded into the control of a rotary tiller, which is a tiller 3 that is mounted so as to be able to move up and down via 10. At the bottom of the rotary tiller 3, a plurality of tillers 11,
11. ． ． Is provided on the periphery and is rotated by the driving force of the power take-off shaft 2 protruding rearward from the rear end of the machine body 1.

In the illustrated example, a single-edged cultivating claw having a nata-edged shape is used, but a double-edged cultivating claw for forward-reverse excavation having a round-edged shape or a flea-edged ordinary claw may be used. The upper side of the cultivating shaft 12 to which the cultivating claw 11 is attached is covered with a main cover 13.
At the rear end, the rear cover 7 is pivotally mounted 14 so that it can swing back and forth.
The sensor box 1 mounted on the main cover 13
5, the swing angle of the rear cover 7 is transmitted.

There is a potentiometer in the sensor box 15, which is interlocked with the rear cover 7 by means of links and the like, and the information of the potentiometer is used as the depth sensor 17, and the analog signal is transmitted through the AD converter 20 as shown in FIG. Connected to a control unit 16 composed of a CPU. The plowing depth setting dial 18 is located near the seat 19 of the aircraft 1.
Is provided, and the analog signal is connected to the control unit 16 including the CPU via the AD converter 20 as shown in FIG.

As shown in FIG. 2, lift arms 21 and 21 are vertically swingably attached to the rear portion of the machine body 1, and the front end portion of the lift arm 21 and the front-rear intermediate portion of the lower link 10 are connected by a lift rod 22. To be done. Lift arm 21
Is an up-and-down oscillating body due to an ascending and descending movement of a hydraulic device (not shown) provided inside the machine body 1. A lift arm angle sensor 23 for measuring an oscillating angle is provided at a base end portion of the lift arm 21. Is attached and is connected to the AD converter 20 by an analog signal.

A rotary tiller 3 is detachably attached to the tips of the lower link 10 and the top link 9, and the input shaft 40 of the rotary tiller 3 and the power take-off shaft 2 are interlocked by a universal joint 8. The lift arm 21 controls up and down. 24 is a position lever, which is a seat 19 of the aircraft 1.
The swing angle that is provided in the vicinity and is manually operated is connected to the AD converter 20 as an analog signal by a sensor (not shown) attached to the base end.

Reference numeral 25 is a forward / reverse switching lever, which is a manual operation lever for switching the rotation direction of the power take-off shaft 1 in the forward / reverse direction, and a forward rotation position switch 26 for detecting the forward rotation position of the lever.
The reverse rotation position switch 27 is connected to the control device 16. Reference numerals 28 and 29 in FIG. 3 are proportional flow control valves for raising and lowering, and when the raising proportional control valve 28 is operated, high-pressure oil is provided in the lift arm 2 inside the body 1 described above.
When the proportional control valve 29 for lowering the hydraulic fluid of No. 1 is operated and the proportional control valve 29 for lowering is operated, the high pressure oil is flowed to the lowering side.

Reference numeral 30 denotes a PTO clutch control valve, which controls turning on and off of the PTO clutch 31 provided in the drive path to the power take-off shaft 2. In the example shown in the figure, pressure oil is used, but an electric clutch has the same effect. is there. Reference numeral 32 denotes a PTO clutch on / off lever, which manually opens and closes the pressure oil of the PTO clutch control valve 30.

33 is an up-cut mode, and when the tiller 3 is raised while this mode is on, the PTO clutch 31 is automatically on / off controlled by the detection of the lift arm angle sensor 23. Since the depth control is well known, only a brief explanation will be given. However, the control device 16 processes the setting information of the plowing depth setting dial 18 and the actual measurement information of the depth sensor 17, and the proportional flow control valve 28 for ascending or the proportional flow rate for descending. The control valve 29 is operated to operate the lift arm 21.
Is moved up and down to set the tilling depth of the tiller 3 to the set value of the tilling depth setting dial 18.

With this depth control, the power take-off shaft 2 is rotated in the normal direction (the plowing mud is thrown backward), and the double-edged plowing pawls 11, 11. ． ． ． The soil surface is excavated and cultivated to a certain depth, and the angle of the rear cover 7 suspended at the rear of the cultivating blade is read by the depth sensor 17 to calculate the cultivating depth backward so that the cultivating depth matches the set value "A". The tiller is automatically adjusted up and down.

Cultivating claws 11, 11. ． ． The lower end of the rear cover 7 that moves forward by stroking the ground surface as it is cultivated deeper escapes toward the rear, and the lower end of the rear cover 7 that moves forward by stroking the ground surface as it is cultivated shallower hangs vertically. Thus, the lower end of the rear cover 7 swings back and forth depending on the amount of soil, but the swinging amount of the rear cover 7 also changes due to another factor. That is, in the normal tillage state, since the scattered mud scattered to the rear directly contacts the rear cover 7, the rear cover 7
Escapes by this energy and senses that the soil amount is larger than the actual setting value "A" of the plowing depth setting dial 18, and controls the position of the tiller 3 to the shallow side during normal rotation.

In this state, when the power take-off shaft 2 is reversed, the tillers 11, 11 ,. ． ． Also reverse rotation (fly plowing mud forward). Plowing claws 11, 11. ． ． Most of the mud that is blown out in the front moves forward, so the direct impact of the mud on the rear cover 7 on the rear side is reduced, and the rocking angle of the rear cover 7 moves forward in the vertical direction more than during normal rotation. It senses that the amount is small, and when reversing, the position of the tiller 3 is controlled deeper.

As described above, the plowing depth control is different because the swinging angle of the rear cover 7 is different even if the plowing depth is set to the same depth. That is, in the control operation in this case, even if the control operation is performed with the same setting value "A" of the plowing depth setting dial 18, the finishing plowing depth does not match between the forward rotation and the reverse rotation. One is excavating deeper.

The flow chart of FIG. 1 is intended to eliminate this drawback. The rotation of the power take-off shaft 2 is sensed in the normal and reverse directions, and the automatic plowing depth control 5 for forward rotation and the plowing depth control for reverse rotation are controlled. The control program of any one of 6 is executed. Next, the single-edged single-sided tillage claws 11, 11 ,. ． Now, the operation when the power take-off shaft 2 is reversed will be described.

When the entire field is viewed, the surface of the excavated mud often has a partly raised mud or a partly recessed surface. In such a case, this nata-edged single-edged plowing claw 11, 11. ． ． ． On the back side of, the excavated mud is strongly pushed forward to move the soil and to level the entire field.

The control in this case is controlled by the plowing depth setting dial 18
When the control operation is performed by reversing with the same setting value of
1,11. ． ． The resistance of the submersion of the
Even when the plowing depth is set to the same value, the plowing claws 11, 11 ... ． The backside resistance of the plants makes the plowing depth control shallow and does not match. In other words, when excavated mud becomes harder, it becomes shallower, and when it becomes softer, it becomes deeper.Thus, when the mud depth changes due to changes in the mud's sinking resistance, there are many changes in the hardness and soil quality of the mud in the field. The flow chart of FIG. 4, in which the unevenness of the finished ground surface becomes more severe than before the work, is intended to eliminate this drawback, and the rotation of the power take-off shaft 2 is sensed in the normal and reverse directions, and the automatic rotation for normal rotation is performed. It is intended to execute one of the control programs of the plowing depth control 5 and the plowing depth control 6a for reverse rotation.
Is manually operated to connect the reverse rotation position switch 27, and the lever setting position of the position lever 24 is, for example, 5 from the ground surface.
If the position is set deeper than cm, the lowest descent position of the tiller 3 depth control at the time of reverse rotation is set to, for example, 5 from the ground surface.
Fix it to the "depth lowest descent fixed value" 6a so that it does not exceed cm. However, this "fixed lowermost depth value" 6a does not need to be limited to 5 cm because it changes depending on the size of the agricultural tractor and the plowing capacity. It is deep on large machines and shallow on small machines.

In this way, when the power take-off shaft 2 is rotated in the reverse direction, for example, if it is fixed at the position of 5 cm, the earth moving work becomes stable, and the tillers 11, 11 ,. ． ． Since there is no digging in, damage can be prevented. Although a sensor for measuring the depth from the surface of the earth is not shown, it can be estimated from the decelera control position, the change amount speed difference of the lift arm angle sensor 23, the rear cover 7, and the like.

The flow chart of FIG. 5 is another example of FIG. 4, in which the rotation of the power take-off shaft 2 is sensed in the normal and reverse directions, and the automatic plowing depth control 5 for forward rotation and the plowing depth control 6c for reverse rotation are shown. When any one of the control programs is executed, the forward / reverse switching lever 25 is manually operated to connect the reverse rotation position switch 27, the depth control is stopped, and the position control is switched to the manual position control.

In this manual position control mode, the driver manually operates the raising and lowering of the tiller 3 visually. The flowchart of FIG. 6 shows another part of automatic switching, in which the rotation of the power take-off shaft 2 is sensed in the forward and reverse directions, and the up-cut mode 33 is automated only during forward rotation. During reverse rotation, the manual PTO on / off lever 32 is used only for operation.

In FIG. 2, 34 is a front wheel and 35 is a rear wheel. The driving force from the engine 36 is the driving force from the main clutch 37 via the traveling drive circuit 38 and the front and rear wheels 3.
Reach 4,35. The driving force of the engine 36 reaches the PTO clutch 31 via another PTO drive path 39.

Both the traveling drive circuit 38 and the PTO drive path 39 have a plurality of speed change mechanisms in the middle, but they are known structures and are not shown.

[Brief description of drawings]

 The figure shows an embodiment of the invention.

FIG. 1 is a flowchart of a main part of the present invention.

FIG. 2 is an overall side view with a partial cross section.

FIG. 3 is a block diagram of the present invention.

FIG. 4 is a flow chart of the second example of the main part of the present invention.

FIG. 5 is a flowchart of the third example of the main part of the present invention.

FIG. 6 is a flowchart of the fourth example of the main part of the present invention.

[Explanation of symbols]

 1 Airframe 2 Power extraction shaft 3 Tiller 4 Mobile farm 5 Automatic plowing depth control 6 Plowing depth control for reverse rotation 7 Rear cover 8 Universal joint

Claims (1)

[Claims] 1. A power take-off shaft 2 is projectingly provided from an end of a machine body 1, and a rear cover 7 angle-sensing type automatic plowing depth control tiller 3 is attached to the vicinity of the power take-off shaft 2 so that the power take-off shaft 2 and the tiller are provided. When the driving direction of the power take-off shaft 2 is changed to the reverse direction in the mobile agricultural machine 4 in which the three are interlockingly connected through the universal joint 8 and the driving direction of the power take-out shaft 2 can be changed to the forward rotation and the reverse rotation, A reverse power take-out device for mobile agricultural machines, which is characterized by keeping the normal automatic tillage depth control 5 circuits inoperative and switching to the original reverse rotation tillage depth control 6 circuit to continue tilling work.